Re: [PATCH v10 0/9] riscv: add SBI Supervisor Software Events support

[Paul Walmsley]

Hi Zhanpeng Zhang,

On Fri, 11 Sep 2026, Zhanpeng Zhang wrote:

> RISC-V does not architecturally define a supervisor-mode non-maskable
> interrupt (NMI). An interrupt that arrives while Linux has cleared SIE stays
> pending and is not observed until interrupts are enabled again. That is
> correct for ordinary interrupt handling, but some kernel work needs an
> NMI-like notification that can run even inside an interrupt-disabled region:
> sampling a PMU overflow at the instruction that caused it, or taking a
> high-priority RAS report promptly, cannot wait for the next unmask boundary.
> 
> The SBI Supervisor Software Events (SSE) extension [1] fills this gap. It lets
> Linux register handlers for events that the SBI implementation can deliver
> ahead of ordinary traps and interrupts, giving RISC-V the NMI-like supervisor
> notification mechanism it otherwise lacks.

Thanks for taking this series forward.  Could you please rebase this 
series against the current riscv/for-next branch and repost?  I tried 
pulling the series in, but it needs quite a few updates since we've 
queued up quite a few patches that touch SBI.

thanks,


- Paul